350 W. ARCHER. 



A variable number of different sized pulsating vacuoles is 

 scattered through the body-mass. 



When an example creeps flatly expanded on a substratum, 

 the two regions of the body-mass — that is, the inner one 

 with the above-mentioned elements, and the outer stratum of 

 sarcode, quite hyaline or extremely minutely granulate, 

 from which pass off the thin lamellar pseudopodia — appear 

 sufficiently distinctly contrasted. But if, on the other hand, 

 which is mostly the case, the elevated membranous pseudo- 

 podia form a complicated system of hollow cavities (as 

 described), and this more at one side than the other, the 

 limits of the two regions become more indistinct, and some- 

 times only with difficulty recognisable. 



Ordinarily the inner mass sends up a number of slender 

 prolongations with contained pigment-granules, more or less 

 far between and through the septa of the superficial cup-like 

 cavities, imparting to such an example, seen from above, a 

 peculiar, irregularly radiate aspect. Sometimes a portion of 

 the inner mass, destitute of colouring granules, but containing 

 vacuoles, may even enter into a pseudopodial lamella. 



Whilst mostly the free borders of the lamellar pseudopodia 

 appear quite smooth, they sometimes appear toothed, as if 

 bitten ; once the author saw on the margin of one a few fine 

 filamentary processes. 



The author's efforts to " cultivate" this form were not 

 successful, so that the only clue he was able to discover as to 

 its reproduction was afibrded by certain sharply bounded 

 globular bodies, met with in the same material, of about the 

 same diameter, surrounded by a thin, clear membrane, and 

 containing a great quantity of similar coloured reddish -brown 

 granules, as in Plakopus in the usual state, as well as a 

 number of globular bodies (of about the same size as the 

 nucleolus of this sarcodine), these sometimes distributed in 

 an equatorial zone. 



Mastigamceha aspera, Eilhard Schulzei (fig. 24), 



is peculiarly remarkable for the possession, concurrently with 

 indubitable pseudopodia, of a well-developed flagellum. The 

 only hitherto recorded organism possessing both pseudopodia 

 and flagellum appears to be that to which Carter (who saw 

 but a single example) had given the name oi Amceba ciliata i^ 

 it may be possibly (but appears scarcely) the same thing, but 



' Loc. cit., Bd. xi, p. 583, t. xxxv, figs. 1 — 3. 



" Carter: ' Anp. and Mag. of Nat. Hist.,' vol. xiii (18Gi), t. ii, f. 19. 



